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Heavy equipment trailer comprising an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, and an elevator operatively c

Heavy equipment trailer comprising an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, and an elevator operatively connected between the rear gooseneck and the jeep for raising and lowering the rear gooseneck to adjust the height of the deck above the ground. The trailer also has a front jeep and a rear booster with dual axles and multiple wheels, with the loads at the front and rear of the deck being distributed respectively between the front jeep and the pulling vehicle and between the rear jeep and the booster. A front jeep includes a lift for raising and lowering the front gooseneck and the front end of the deck.

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1. A heavy equipment trailer, comprising: an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, an elevator operativel

1. A heavy equipment trailer, comprising: an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, an elevator operatively connected between the rear gooseneck and the jeep for raising and lowering the rear gooseneck to adjust the height of the deck above the ground, a crank mounted on the jeep for rotation about a longitudinally extending axis, and control arms pivotally connected between opposite ends of the crank and the gooseneck for keeping the front end portion of the gooseneck centered laterally of the jeep as the gooseneck is raised and lowered. 2. The trailer of claim 1 wherein the elevator is rotatably connected to the jeep for rotation about a horizontally extending axis, and the rear end of the rear gooseneck is pivotally connected to the elevator in a load supporting manner at a point spaced from the axis, with an actuator operatively connected to the elevator for rotating the elevator about the axis to raise and lower the rear gooseneck and the deck. 3. The trailer of claim 2 wherein the actuator comprises an operating cylinder connected between the rear gooseneck and the elevator. 4. The trailer of claim 1 including means associated with the elevator for locking the deck at different heights above the ground. 5. The trailer of claim 4 wherein the elevator is rotatably connected to the jeep and pivotally connected to the rear gooseneck, and the means for locking the deck at different heights includes interlocking teeth on the elevator and on a latch arm which is movable relative to the elevator for bringing the teeth on the arm into and out of engagement with the teeth on the elevator to lock the elevator in different rotational positions corresponding to the different deck heights. 6. The trailer of claim 1 further comprising a front jeep with ground engaging wheels positioned in front of the deck for connection to the pulling vehicle, with the front gooseneck being connected to the front jeep in front of the wheels so that the load at the front of the deck is distributed between the front jeep and the pulling vehicle, and a booster with ground engaging wheels connected to the rear jeep in load supportive relationship, with the elevator being connected to the rear jeep behind the wheels on the rear jeep so that the load at the rear of the deck is distributed between the rear jeep and the booster. 7. The trailer of claim 6 wherein the jeeps and the booster each have dual axles with eight wheels on each of the axles. 8. The trailer of claim 6 wherein the booster is pivotally connected to the rear jeep for rotation about a vertical axis, and means is connected between the rear jeep and the booster for turning the booster about the axis to actively steer the rear of the trailer. 9. A heavy equipment trailer, comprising: an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, an elevator rotatably connected to the jeep for rotation about a horizontally extending axis, a load supporting pivotal connection between the elevator and the rear gooseneck, an actuator operatively connected to the elevator for rotating the elevator about the horizontally extending axis to raise and lower the rear gooseneck and the rear of the deck, and interlocking teeth on the elevator and on a latch arm which is movable relative to the elevator for bringing the teeth on the arm into and out of engagement with the teeth on the elevator for locking the elevator in different rotational positions to maintain the deck at different heights above ground, wherein the teeth on the elevator extend along an arcuate path centered about the axis of the pivotal connection between the elevator and the rear gooseneck. 10. The trailer of claim 9 wherein the latch arm is pivotally mounted on the rear gooseneck for bringing the teeth on the latch arm into and out of engagement with the teeth on the elevator. 11. The trailer of claim 9 wherein the elevator comprises a pair of lift plates spaced laterally apart and connected together for movement in concert about the horizontally extending axis, with the teeth on the elevator extending along arcuately curved edges of the lift plates and latch arms with teeth engagable with the teeth on both of the lift plates. 12. The trailer of claim 11 wherein the lift plates are connected to the rear gooseneck by a pair of axially aligned pivot pins and the arcuately curved edges of the lift plates are centered about the axis of the pivot pins. 13. The trailer of claim 9 further comprising a booster with ground engaging wheels positioned behind and pivotally connected to the rear jeep in load supportive relationship for rotation about a vertical axis, steering means connected between the rear jeep and the booster for turning the booster about the vertical axis to steer the rear of the trailer. 14. The trailer of claim 13 wherein the connection between the elevator and the rear jeep can be shifted forwardly and rearwardly of the jeep to adjust the distribution of the load between the rear jeep and the booster. 15. The trailer of claim 9 including means connected between front end portions of the rear gooseneck and the rear jeep for keeping the front end portion of the gooseneck centered laterally of the jeep as the gooseneck is raised and lowered. 16. The trailer of claim 15 wherein the means for keeping the front end portion of the gooseneck centered comprises a crank mounted on the jeep for rotation about a longitudinally extending axis, and control arms pivotally connected between opposite ends of the crank and the gooseneck. 17. A heavy equipment trailer, comprising: an elongated deck, a front gooseneck extending from the front of the deck for connection to a pulling vehicle, a rear gooseneck extending from the rear of the deck, a jeep with ground engaging wheels positioned to the rear of the deck, a lift plate rotatably connected to the jeep for rotation about a horizontally extending axis, a load supporting pivotal connection between the lift plate and the rear gooseneck, an actuator operatively connected to the lift plate for rotating the lift plate about the horizontally extending axis to raise and lower the rear gooseneck and the rear of the deck, latch teeth extending along an arcuately curved edge of the lift plate, and a pivotally mounted latch arm with teeth that can be brought into and out of locking engagement with the teeth on the lift plate for locking the lift plate in different rotational positions to maintain the deck at different heights above ground. 18. The trailer of claim 17 wherein the arcuately curved edge of the lift plate is centered about the axis of the pivotal connection between the lift plate and the rear gooseneck. 19. The trailer of claim 17 wherein the latch arm is pivotally mounted on the rear gooseneck. 20. The trailer of claim 17 including means connected between front end portions of the rear gooseneck and the rear jeep for keeping the front end portion of the gooseneck centered laterally of the jeep as the gooseneck is raised and lowered. 21. The trailer of claim 20 wherein the means for keeping the front end portion of the gooseneck centered comprises a crank mounted on the jeep for rotation about a longitudinally extending axis, and control arms pivotally connected between opposite ends of the crank and the gooseneck.